Attempt to fix harmless compiler warnings that reportedly appear in clang 15.

FossilOrigin-Name: c045d76b908a8c90d22511df7884e78d452b250db9ba70d4cb0935048a3c3ac4

manifest

@@ -1,5 +1,5 @@
-C Improved\sdetection\sof\sinvalid\scommand-line\sarguments\sto\sthe\sshowdb\sand\nshowwal\sdebugging\sutility\sprograms.
-D 2023-02-03T12:03:56.008
+C Attempt\sto\sfix\sharmless\scompiler\swarnings\sthat\sreportedly\sappear\sin\sclang\s15.
+D 2023-02-03T14:57:40.622
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -607,7 +607,7 @@ F src/os_setup.h 6011ad7af5db4e05155f385eb3a9b4470688de6f65d6166b8956e58a3d87210
 F src/os_unix.c 49b0d3d0f86fc4736d1b9a71035bbd791b892ed6908803f270d4d71f149c60ac
 F src/os_win.c 295fe45f18bd86f2477f4cd79f3377c6f883ceb941b1f46808665c73747f2345
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
-F src/pager.c fc6d3ec7017d7369ab5dc5421ad1763ff224551c9381866b6da69040db62e406
+F src/pager.c a70ebfdca54fce32ba748087f2fc8739af479222590148dfa17d4ad71bcf8ff2
 F src/pager.h f82e9844166e1585f5786837ddc7709966138ced17f568c16af7ccf946c2baa3
 F src/parse.y 8e67d820030d2655b9942ffe61c1e7e6b96cea2f2f72183533299393907d0564
 F src/pcache.c f4268f7f73c6a3db12ce22fd25bc68dc42315d19599414ab1207d7cf32f79197
@@ -621,7 +621,7 @@ F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
 F src/resolve.c d62c5665279cc7485f9d45b5e20911cc7b19c203f268321a90d05d74f4725750
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
 F src/select.c c3ce1b49cca2c66c8c88fe7d9e1f3db23590deb4dd631619ad90e1e5d21bcf1f
-F src/shell.c.in f7fd28e68269a58690c665e8a5e96ba242201267925fbd335f08695c79fc6db7
+F src/shell.c.in 250817509dbf12e258e334fdcd87901e35a6b63dc285885fec5f577ebb67b498
 F src/sqlite.h.in d2a5fc1f6740bd02b571d33d2eb308fa7d1b0fac5b86f6f1fe8310cd49bca97d
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h da473ce2b3d0ae407a6300c4a164589b9a6bfdbec9462688a8593ff16f3bb6e4
@@ -2046,8 +2046,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 5c19491c36b9e2128430e4f153bdef48c3f7b6541d44f36044e8fc2921ecc830
-R ffa507b26ffffe21cc5887aba257a189
+P 75cdaafc77b8a1efc84e71e90470994227f376e7d7de34c813e75dcadbb9f268
+R c5631603f94a109df4203869b924462f
 U drh
-Z 94a99f30183c2c51b7133395ab993677
+Z 35ae00f683438623b1e428d471df871e
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-75cdaafc77b8a1efc84e71e90470994227f376e7d7de34c813e75dcadbb9f268
+c045d76b908a8c90d22511df7884e78d452b250db9ba70d4cb0935048a3c3ac4

src/pager.c

@@ -4693,7 +4693,6 @@ int sqlite3PagerOpen(
   u32 szPageDflt = SQLITE_DEFAULT_PAGE_SIZE;  /* Default page size */
   const char *zUri = 0;    /* URI args to copy */
   int nUriByte = 1;        /* Number of bytes of URI args at *zUri */
-  int nUri = 0;            /* Number of URI parameters */
 
   /* Figure out how much space is required for each journal file-handle
   ** (there are two of them, the main journal and the sub-journal).  */
@@ -4741,7 +4740,6 @@ int sqlite3PagerOpen(
     while( *z ){
       z += strlen(z)+1;
       z += strlen(z)+1;
-      nUri++;
     }
     nUriByte = (int)(&z[1] - zUri);
     assert( nUriByte>=1 );

src/shell.c.in

@@ -5685,10 +5685,13 @@ static int sql_trace_callback(
 /*
 ** A no-op routine that runs with the ".breakpoint" doc-command.  This is
 ** a useful spot to set a debugger breakpoint.
+**
+** This routine does not do anything practical.  The code are there simply
+** to prevent the compiler from optimizing this routine out.
 */
 static void test_breakpoint(void){
-  static int nCall = 0;
-  nCall++;
+  static unsigned int nCall = 0;
+  if( (nCall++)==0xffffffff ) printf("Many .breakpoints have run\n");
 }
 
 /*